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<meta charset="utf-8">
<title>WebGL buffer size change test for bindBufferBase/bindBufferRange</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/webgl-test-utils.js"></script>
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<div id="console"></div>
<script>
"use strict";
description("WebGL buffer size change for bindings through bindBufferBase/bindBufferRange");

// This test verifies the ES3 behavior, that the bound buffer range (offset, size) is not
// limited by the actual buffer size, and the driver is responsible that no out-of-range
// access may happen.

var wtu = WebGLTestUtils;

var gl = wtu.create3DContext(undefined, undefined, 2);

debug("");
debug("bindBufferBase with TRANSFORM_FEEDBACK_BUFFER target");
var buffer1 = gl.createBuffer();
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, buffer1);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
    "Calling bindBufferBase on a buffer where no storage is allocated should succeed.");
shouldBe("gl.getParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING)", "buffer1");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)", "buffer1");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_SIZE, 0)", "0");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_START, 0)", "0");

gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, 4, gl.STATIC_DRAW);
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)", "buffer1");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_SIZE, 0)", "0");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_START, 0)", "0");

wtu.glErrorShouldBe(gl, gl.NO_ERROR);

debug("");
debug("bindBufferBase with UNIFORM_BUFFER target");
var buffer2 = gl.createBuffer();
gl.bindBufferBase(gl.UNIFORM_BUFFER, 1, buffer2);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
    "Calling bindBufferBase on a buffer where no storage is allocated should succeed.");
shouldBe("gl.getParameter(gl.UNIFORM_BUFFER_BINDING)", "buffer2");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_BINDING, 1)", "buffer2");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_SIZE, 1)", "0");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_START, 1)", "0");

gl.bufferData(gl.UNIFORM_BUFFER, 8, gl.STATIC_DRAW);
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_BINDING, 1)", "buffer2");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_SIZE, 1)", "0");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_START, 1)", "0");

wtu.glErrorShouldBe(gl, gl.NO_ERROR);

debug("");
debug("bindBufferRange with TRANSFORM_FEEDBACK_BUFFER target");
var buffer3 = gl.createBuffer();
gl.bindBufferRange(gl.TRANSFORM_FEEDBACK_BUFFER, 0, buffer3, 4, 8);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
    "Calling bindBufferRange on a buffer where no storage is allocated should succeed.");
shouldBe("gl.getParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING)", "buffer3");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)", "buffer3");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_SIZE, 0)", "8");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_START, 0)", "4");

gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, 4, gl.STATIC_DRAW);
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)", "buffer3");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_SIZE, 0)", "8");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_START, 0)", "4");

gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, 12, gl.STATIC_DRAW);
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)", "buffer3");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_SIZE, 0)", "8");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_START, 0)", "4");

wtu.glErrorShouldBe(gl, gl.NO_ERROR);

debug("");
debug("bindBufferRange with UNIFORM_BUFFER target");
var buffer4 = gl.createBuffer();
var offset = gl.getParameter(gl.UNIFORM_BUFFER_OFFSET_ALIGNMENT);
gl.bindBufferRange(gl.UNIFORM_BUFFER, 1, buffer4, offset, 12);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
    "Calling bindBufferRange on a buffer where no storage is allocated should succeed.");
shouldBe("gl.getParameter(gl.UNIFORM_BUFFER_BINDING)", "buffer4");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_BINDING, 1)", "buffer4");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_SIZE, 1)", "12");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_START, 1)", "offset");

gl.bufferData(gl.UNIFORM_BUFFER, offset + 8, gl.STATIC_DRAW);
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_BINDING, 1)", "buffer4");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_SIZE, 1)", "12");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_START, 1)", "offset");

gl.bufferData(gl.UNIFORM_BUFFER, offset + 12, gl.STATIC_DRAW);
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_BINDING, 1)", "buffer4");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_SIZE, 1)", "12");
shouldBe("gl.getIndexedParameter(gl.UNIFORM_BUFFER_START, 1)", "offset");

wtu.glErrorShouldBe(gl, gl.NO_ERROR);

debug("");
var successfullyParsed = true;
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